Machine for grinding mowing-machine knives



3 Sheets-Sheet 1.

(No Model.)

W. S. WILLIAMS.

MACHINE FOR GRINDING MOWING MACHINE KNIVES.

Patented Dec. 7, 1886.

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(N0 Modell) 3 Sheets-Sheet 2.

W. S. WILLIAMS.

MACHINE FOR GRINDING MOWING MACHINE KNIVES.

N. PETERS. Plmwmhn m hu Washmglnn, D. C.

(No Model.) 3 Sheets-Sheet 3.

W. S. WILLIAMS.

MACHINE FOR GRINDING MOWING MAGHINE'KNIVES. I No. 353,908. Patented Dec. '7, 1886.

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UNITED STATES PATENT OFFICE.

WILLIAM S. WILLIAMS, OF EAST HARTFORD, ASSIGNOR TO SAMUEL E. ELMORE, OF HARTFORD, AND EDGAR BREWER, OF EAST HARTFORD,

CONNECTICUT.

MACHINE FOR GRINDING MOWlNG-MACHINE KNIVES.

SPECIFICATIGN forming part of Letters Patent No. 353,908. dated December 7, 1886.

Serial No. 199,334. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM S. WILLIAMs, of East Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in lVIachines for Grinding Mowing Machine and Harvester Knives, of which the following is a full, clear, and exact description, whereby any one skilled in the art can make and use [0 the same.

My invention relates to the class of devices for holding the knives used in mowers, harvesters, and machines of the like class for the purpose of sharpening the teeth; and the 0b ject of my invention is to provide a device by the use of which knives of this class may be accurately and uniformly ground.

To this end my improvement consists in a blade-clamp attached to a bar that is hinged and pivoted to a rocking bar at a point near a the center of the former, and having a fixed support at one end of the clamp-bar, in combination with the several hinges and pivots, whereby the edge of a given tooth of the cutting-bar is presented to a grindstone in proper position to grind a beveled cutting-edge on the tooth as the bar is rocked back and forth, and

'in details of the construction of the several parts and in their combination, as more particularly hereinafter described, and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 is a top or plan view of myimproved grinding device. Fig. 2 is a front viewin ele- 5 vation. Fig. 3 is an end view. Fig. 4 is a sectional view taken on line 00 a: of Fig. 1. Fig. 5 is a detail sectional view of the device connecting the clampbar and the fixed rest, taken on line 3 y of Fig. 1. Fig. 6 is a detail 0 view of the blade-holding clamps with springs about the clamping-screws.

In the accompanying drawings, the letter A denotes a bed, table, or standard supporting a grindstone, b, on the bearings b. To

5 the shalt If, to which the stone is secured, is fasta bevel gear-wneel, b and in mesh wit-h it is a larger bevel-gear, 0, fast to a shaft, 0, that is arranged at right angles to the shaft b and presents on each end a squared part, 0 to receive a crank-handle, 0 by means of which the stone may be turned from either side of the stone-support by changing the handle from one end of the shaft to the other. The precise form. material, and arrangement of the grinder and its supports are not essential to my invention, as any convenient grinder and frame may be used.

The main features of my improvement are embodied in the holder D and a. fixed rest, E. The holder D consists of a base-block, d, a rocking bar, 02, hinged to the base-block, and a blade-bar, d, that is connected to the rocking bar by an adjustable swivel-joint,f. The block 02 is pivoted to the bed A by means of the bolt a, that passes through the block and through a slot, a, in the bed, so that the block may be swung upon the bed with the bolt as a pivot, and carrying with it the holder and connected parts. To the outer end of this block is hinged a latch, d composed of the strap 61*, with a not formed in the cross-bar at the end, and a screw-bolt, d" bornein the nut, and having a handle fitting about the bolt between the crossbar and a nut, d, on the outer end of the bolt. The inner end of the bolt takes into a socket or recess in the outer face of the lug a which is secured to the bed A.

The rocking bar 01 is hinged at its lower end to the block d by means that allow it to swing back and forth in a plane at substantially right angles to the plane of the baseblock d, and the bar has near the bottom and on theback side a projection, 9. that by contact with the block forms a stop that limits the backward play of the bar, while on the front side it bears a lug, g, and a screw-bolt, g passing through the lug and forming an adjustable stop, that by contact with the blocks determines the extent of the forward play of the bar.

The carriage f is secured to the rocking bar d by means of a bolt passing through thelongitudinal slot d in the bar and a not on the rear end of the bolt taking againstastrap that straddles the slot and rests in a grooved way in the bar.

To the carriage f is pivotally secured an angle-arm, f which is held by a threaded nut, f, fitted on a threaded lug projected from the bo1tf which secures the carriage to theholder D. The angle-arm is arranged to turn on the bearing, and is set in any desired position by h, between the jaws h of which a knife or cutter blade, 1'. may be clamped by means of the clamps j, that are located near the outer ends 7 of the blade-bar, and the clampj, located near the center of the bar. On the outer ends of this'blade-bar are secured the bevel-adjusters k k, by means of which, in connection with the fixed rest E, the angle of the blade 1, with respect to the grinding-surface and the bevel of the 'cutting'edge of the blade, is determined.

Each of the adjusters k k is formed of a threaded shaft provided with a crank-arm, k, above the bar, in convenient position to raise and lower the screw that passes through a threaded socket fastened in the bar. The lower. end of this screw-shaft is preferably rounded to form the ball of a ball-and-socket joint, Z, that forms part of the universal joint m, that connects the fixed rest and the bladebar. The socket-piece Z is hinged between the upright ears or lugs on the arm Z, that is pivotally connected to the rest E by means of the bolt m passing through a slot in the rest, and the socket-piece of the ball-and-socket joint Z is made up of two parts, the upper part or plate, Z being permanently attached to the lower end of the screw-shaft of the adjusters k 76'. The holdingplate Z is formed, with apertures 2 having turning-slots Z leading therefrom, the purpose being to admit the placing of plates over the heads of the screws Z, and being turned partly around to the limit of the slots under the heads of the screws, and then lock the plates to the socketpiece. The plates may be removed by turning them in reverse direction until the heads of the screws come into the apertures. If necessary, the screws may be clamped tight when the plate is set.

The several parts of the machine having been put together, substantially as show-n in Fig. l, a cutter, i, is clamped to the blade-bar,

the limit of the forward play of the rocking arm determined by adjusting the screw 9, the bevel to which the edge 7? of the blade to be ground is determined by means of the adjuster 7c, and then bya back-and-forth rocking movement imparted to the holder D the edge 2" is ground accurately as to the shape of cuttingedge and bevel thereof. After having ground a single edge of one of the teeth, the blade i is unclamped, is slid lengthwise until another tooth is brought into proper position for'grinding, and is again clamped, and the grinding operation repeated. As soon as one edge of all the teeth have been ground, the base-block is unclamped, is swung sidewise upon the central pivot, and is clamped to the lug (it upon the opposite side of the base from the I lug a, the adjuster having been unclamped from the universal joint m, and the adjuster is fastened to the joint at the other end of the fixed rest E.

The method of adj usting the parts and grinding the edges i of the several teeth is precisely similar to that already described for grinding the edges 2.

The function of the hinge of the swiveljoint f andof the ball-a'nd-socket joint Z is to permit the blade-bar to be swung upward and backward, so as to examine the cutting-edge of the blade being ground.

It is obvious that any cutting-bladeas of a plane, chisel, or like tool, or one having an edge beveled upon both sides-may be readily ground by my improved device by clamping the blade to the, holder with its edge at an angle to the bar, substantially in the position of the cutting-edge i in relation to the stone or grinder b.

In order to adapt the clamps j to more readily hold a cutter-bar near the end, that is often thicker than the rest of the bar, I make theclamp hold with a yielding pressure by placing a spring about the bolt above the blade- 7 bar and below the nut, as shown in Fig. 6.

I do not limit myself to the precise. construction of the several elements making up the holder, rest, rocking bar, and connectingjoints, as it is obvious that many variations may be made in these without departing from my invention.

I claim as my invention- 1. In combination with a base-block, a rocking bar hinged to the baseblock, a blade-bar bearing a blade-clamp and connected to the rocking bar by a swivel-joint, and a fixed rest with means whereby the blade-bar is pivotally connected to the rest, all substantially as described.

2. In combination with a base or support, a base-block. d, pivotally connected to the bed, a rocking bar hinged to the base-block, abladebar bearing a blade-clamp, a fixed rest, and means whereby the blade-bar is pivotally connected to the rest, all substantially as described.

3. In combination with a bed, abase-block, d, with a connected latch, d, the locking-lugs fast to the bed or table, a rockingbar hinged to the base-block, a blade-bar bearing a bladeclamp and attached to the rocking bar by a swivel-joint, afixed rest, andauniversal joint, whereby the fixed rest and blade-bar are connected, all substantially as described.

4. In combination with. the bed A, supporting a grindstone, b, the shaftjb", bearing the bevel-gear b the shaft 0, bearing the bevelgear a, and having its outer ends squared to receive a crank-handle, holder D, hinged to the base-block, and bladebar 01, with the blade-clamps, the fixed rest E, and the uni-' versal joint m, connecting the rest and the blade-bar, all substantially as described.

5 fixed rest, with means whereby the blade-supporting clamp may be given a swinging play to and from the grinding-surface, swinging and turning upon the latter joint and upon the pivotal connection with the rocking ban,

" 10 all substantially as described.

6. In a device for grinding tool-blades, a base, a rocking bar hinged to the base, a blade bar connected to the rocking bar by a swiveljoint and to a fixed rest by a universal joint,

[5 the blade-bar in the back-and-forth motion required to grind the blade rocking upon two pivotal supports, all substantially as described.

7. In a device for grinding tool-blades, a

20 base-block, d, a rocking bar, d, hinged to the base and bearing the adjustable stop 9 and the stop g, a blade-bar, (1*, connected to the rocking bar by a swivel-joint, f, and to a fixed rest bya universal joint, m, all substantially as described.

8. In combination with a base-block, d, a rocking bar, 11, hinged to the base-block, a swivel-joint, f, borne on the adjustable carriage f, attached to the rocking bar. the blade-bar d, attached to the joint and bearing a blade-clamp, and a fixed rest connected to the blade-bar by a universal joint, the bladebar in the back-and-torth motion required to grind the blade rocking upon two pivotal supports, all substantially as described.

WILLIAM S. WILLIAMS.

Witnesses:

SAML. E. ELMORE, EDGAR BREWER. 

